Rotary core drill for oil wells



P. C. HILL. ROTARY CORE DRILL FOR OIL WELLS.

APPLICATION FILED DEC-9, 1921.

Patented Aug. 29, 1922.

UNITED STATES PAUL C. HILL, OF CEMENT, OKLAHOMA.

ROTARY CORE DRILL FOROIL WELLS.

Specification of Letters Patent.

Application med Deeember 9, i921. serialize.. 521,128.

To all to m/m it may concer-a:

Be it known that I, PAUL CORTLANDT HILL, a citizen of the United States, residing at Cement, in the county of Caddo andl State of Oklahoma, have invented certain new and useful Improvements in Rotary Core Drills for Oil Wells-of which the following is a specification. ,i i

rlhis invention appertains to certain improvenients in well drills, and more particularly to a rotary core drilling type of the same involving a means for taking samples of the earths stratum through which ,the drill may be working at any time during the drilling operation. i

The principal object of the invention is to provide vfor a well drill as characterized., and one wherein the sample takingineans is operable throughout the working movement of thedrill, but the cuttings taken up by the same are delivered therefrom to the interior of the drill and washed from the latter outwardly of the head of. the drillv yuntil it is desired to make an examination of the cuttings as may be contained within the means at a particular time, when the drill is to be withdrawn fro-m the well bore, and the sample taking means extracted from the drill for the purpose. Y

Another object of the invention isto provide for a drill of the class mentioned,y and.

one of'an extremely simplified, inexpensive, durable and eicient constructionv and arrangement of parts, which parts are readily assembled and detachable one from the other for purposes of replacement andrepair.

A further object of the invention is `to provide for a drill of the class mentioned,

and one involving the use of a sampling tube disposed centrally of the drill proper, and which is made up of preferably detachable sections adaptedfor ready removal from operative position for examination of a contained sample, or for replacementand repair ofthe parts thereof7 the lower portion or section of the tube having its lower end projected below the lowerI end of the drill` proper and provided with earth cutting elements or cutting teeth, whereby to aid in the freeing of the cuttings taken up by the same for sampling purposes.

With the foregoing and other objects in view, the invention resides in the certain novel and useful construction, arrangement and operation of parts as will be hereinafter more fully described, set forth in the api' pended claimtand illustratedin the accompanying drawing, in which zi Figure 1 is an elevation, partly in section,

of a' preferred embodiment of the drill,

Figure 2 is a vertical section of thedrill, and

y Figure 3 is an enlarged fragmentary sectional `detail vof the upper end portion of the sampling" tube of the drill.

Referring to the drawing, the numeral 10 Patented Aug. 29, 1922.

indicates a. drill 4head orbit portion, preferably of the usual and so called sh tail type `having a tapered threaded shank orportion 11 rising centrally from the upper end edge thereof for threaded engagement with-the correspondingly ltapered and threaded lower end lportion of the bore 12 ofa coupling member or Vsleeve 13, the upper straight portion of the bore of the latter being threaded for engagement on the lower complementally threaded end of a hollow drill stem 14. The

upper edge portionof the drill heador bitv y 10 is thickened equally with respect to the opposite side faces of the blade portion thereof, as at `15, while the latter is thickened equally at the opposite sides of the same and on itsverticalcenter as at 16, the thicki ened portions '15, being formed to curve downwardly as at 15 into the said'opposite faces of the bladeportion, and the thickened portion 16 to taper downwardly from its upper end substantially as is shown in Figure 2. Extending upwardly of the opposite side portions of the thickened portion 15 are a pair of ducts 17 and 18, the lower ends of which open through the curved Walls thereof, while the upper lends of the same open through the end face of the tapered shank lland communicate with the bore 12 of the coupling 13 for the purposekof discharging water to either side of the b-lade portion of the drill head `or bit to aid the latter in its drilling` operation.

Extending vertically and cent-rally of the thickened portion 16 of the drill head or bit 10, is a bore v19 'which hasinserted in its lower end a sample taking tube section 20, and in its upper end a sample taking and receiving section 21, the lower section 2O having its upper end threaded as at 20 into engagement with the wall of the bore 19 at a point removed at a substantial distance from the upper end thereof, and its lower end projecting for a relatively short distance below the lower edge of the drill head or bit, while the connected end of the upper portion 21 is threaded as at 21 into the upper end of the bore 19 and into abutting relation :with respect to the upper end of the lower section 20. The upper section 21 o-fthe sampleftaking device projects concentrically upward' foffthe aligned bores of the coupling 13 and the drill stem 14C for a suitable distance, and has its upper open endthreaded as at 21 to receive thereon an annular cap face or member 22, on .which is lpivoted or 'hinged as at 23 a closure member24, the under i-face of the latter having an annular groove! within the same for the reception of al-gasket '25 arranged to seat 'on the open end of the upper tube section 21. The lower profjecting 'end of the lower tube section 20 has its edge formed to provide a series lof cutting elements or teeth 26, whereby to assure of the breaking up of the cuttings of thedrill properto a suitable degree of fineness so as to freely pass upwardly of the sampling tube sections 20 and 21, and lby unthreading the lower section 20, the cutfting'teeth 26 may be readily sharpened withprogresses downwardly through the earth, the cuttings ofthe drill proper are further 1broken up bythe cutting teeth 26 of the lower vsampling tube section 20, and `the fine cuttings passed upwardly of 4the latter and into and through the upper section'21 l y and are "discharged outwardly'of-the upper end of 'the section 21, v1the closure'Qli Abeing 'forced to open position by the pressure exn erted thereon by `the cuttings, 3the 'passageway through 'the sections '20 and Y21 `being i' `lrept free from clogging by the presence of water in the well bore and of the upflow of a certain amount of the same therethrough, the pressure of the downflow of water in the drill stem 14 and the force of 'gravity normally forcing the closureon v'the upper end of the section 21 andclosing Xthe apassage throughthe same. When 'it is not desiredto 'test Vout samples ofthe' earth 'passing "upwardly offthetubesections 20 and 21,2thc lcuttings are discharged ffrom the upper end ofthe upper section21 and intothe bore of the drill head or bit 10 andthe stem .14

are withdrawn from the well bore, when the upper tube -sectionf21, or both this section and the lower section 20, are unthreaded and removed from the drill vhead vor bit 10, and the `cuttings therein removed for such purpose. This removal of the upper section 21 for the purpose of test-ing or sampling the cuttings therein may be accomplished with-y out removing the drill from the well bore, if desired, and this is to be readily and quickly accomplished by the lowering of a suitable grappling tool (not shown) downwardly of the drill stem, and into engagement with the exposed length of the section 21, whereby the same may be unthreaded fromV operative position and withdrawn upwardly of vthe drill stem, when,after the retained sample cuttings therein have been removed, the section 21 may be lowered within the` stern and rethreaded into operative position.

'From the foregoing, it will be readily'ap- Vparent that, while a preferred embodiment of the drill has been described and illustrated herein in specific terms and details of construction, arrangement and operation,

various changes lin and modiicationsof the same may be resorted to without departing from the spirit of "the invention, :or 'the scope of the claim appended hereto.

' Having thus 'fully described the'invention, what lis claimed, is :4- i

ln a well drilla-s characterizedpa hollow drill stern, a drill ybit carriedat the lower end o'f said stern, a straight sectional tubular sample .taking device mounted vertically `of said drill bit, the lower -o'f the sectionspf vsaid devicei'being removably secured in said drill-bit and having'its'lower end projecting for a distance below the lower vend edge thereof andthe upper offthe sections being 4removably secured in said drill bit andeX'- Atending upwardly from'the samewithin said drill stem and in alignment with fthe said ilower section, and a hinged closure vat the free end of theupperof the seetionsfof said device.

ln testimony whereof, l 'afliX 'my signature hereto. i

PAUL vo. rrrLL. 

